TWAS Arab Regional Partner (TWAS-AREP)
- Algeria
- Bahrain
- Comoros (the)
- Djibouti
- Egypt
- Iraq
- Jordan
- Kuwait
- Lebanon
- Libya
- Mauritania
- Morocco
- Oman
- Qatar
- Saudi Arabia
- Somalia
- State of Palestine (the)
- Sudan (the)
- Syrian Arab Republic (the)
- Tunisia
- United Arab Emirates (the)
- Yemen
TWAS Central and South Asia Regional Partner (TWAS-CASAREP)
- Afghanistan
- Azerbaijan
- Bangladesh
- India
- Iran (Islamic Republic of)
- Kazakhstan
- Kyrgyzstan
- Maldives
- Nepal
- Pakistan
- Sri Lanka
- Tajikistan
- Türkiye
- Turkmenistan
- Uzbekistan
TWAS East and South-East Asia and the Pacific Regional Partner (TWAS-SAPREP)
- Bhutan
- Brunei Darussalam
- Cambodia
- China
- Taiwan, China
- Fiji
- Indonesia
- Kiribati
- Lao People's Democratic Republic (the)
- Malaysia
- Marshall Islands (the)
- Micronesia (Federated States of)
- Mongolia
- Myanmar
- Nauru
- Palau
- Papua New Guinea
- Philippines (the)
- Samoa
- Solomon Islands
- Thailand
- Timor-Leste
- Tonga
- Tuvalu
- Vanuatu
- Viet Nam
TWAS Sub-Saharan Africa Regional Partner (TWAS-SAREP)
- Angola
- Benin
- Botswana
- Burkina Faso
- Burundi
- Cabo Verde
- Cameroon
- Central African Republic (the)
- Chad
- Democratic Republic of the Congo (the)
- Congo (the)
- Côte d'Ivoire
- Equatorial Guinea
- Eritrea
- eSwatini
- Ethiopia
- Gabon
- Gambia (the)
- Ghana
- Guinea
- Guinea-Bissau
- Kenya
- Lesotho
- Liberia
- Madagascar
- Malawi
- Mali
- Mauritius
- Mozambique
- Namibia
- Niger (the)
- Nigeria
- Rwanda
- Sao Tome and Principe
- Senegal
- Seychelles
- Sierra Leone
- South Africa
- South Sudan
- Togo
- Uganda
- United Republic of Tanzania (the)
- Zambia
- Zimbabwe
TWAS Latin America and the Caribbean Regional Partner (TWAS-LACREP)
- Antigua and Barbuda
- Argentina
- Aruba
- Bahamas (the)
- Barbados
- Belize
- Bolivia (Plurinational State of)
- Brazil
- Chile
- Colombia
- Costa Rica
- Cuba
- Dominica
- Dominican Republic (the)
- Ecuador
- El Salvador
- Grenada
- Guadeloupe
- Guatemala
- Guyana
- Haiti
- Honduras
- Jamaica
- Mexico
- Nicaragua
- Panama
- Paraguay
- Peru
- Saint Vincent and the Grenadines
- Suriname
- Trinidad and Tobago
- Uruguay
- Venezuela (Bolivarian Republic of)